REACTOR PRESSURE VESSEL FLOWS

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REACTOR PRESSURE VESSEL FLOWS

• Dr A C Thompson
• C M Hodge

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OVERVIEW

• Introduction.
• Method - Phoenics VR model.
• Results
• RPV inlet flows
• Flow patterns fixes
• Conclusions

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INTRODUCTION

• Design Study.
• Two core PWR.
• Single inlet/outlet RPVs.

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METHOD FLOW MODELLING

• Phoenics 3.1, VR.
• Single Phase, unheated flow.
• Simple turbulence model.
• Polar Coordinates.

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METHOD - RPV MODEL

• Vessel walls and base.

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METHOD - RPV MODEL

• Vessel walls and base.
• Barrel shields and nozzles.

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METHOD - RPV MODEL

• Core Structures.
• Core Inlets.

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CORE INLET FLOW
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SHIELD FLOW WITH DUAL INLET
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CORE INLET FLOW SINGLE INLET
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SHIELD FLOW WITH SINGLE INLET

• Upward flow in both outer Shield paths.

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THE FLOW FIX DEVICE
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SHIELD FLOW WITH FIX 1

• Downward flow in outer Thermal Shield.
• Upward flow in intermediate Shield.

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THE FINAL FLOW FIX DEVICE

• 2 Concentric Scoops.
• 1800 Circumference.

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SHIELD FLOW WITH FINAL FIX

• Downward flow in all Thermal Shields.

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CORE INLET FLOW- FINAL FIX
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GRID AT CORE 1ST PASS INLETS
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CORE INLET VELOCITY PROFILE
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CONCLUSIONS

• VR Interface Advantages
• Reduced Model build time.
• Improved ability to adjust model.
• Viewing of results much improved.
• Highlighted unexpected area of concern.
• Thermal shields.
• Low loss fix easily developed.
• Core inlet flow uniformity.
• Grid sensitivity.

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